...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >High-pressure phase equilibrium measurements and thermodynamic modeling for the systems involving CO2, ethyl esters (oleate, stearate, palmitate) and acetone
【24h】

High-pressure phase equilibrium measurements and thermodynamic modeling for the systems involving CO2, ethyl esters (oleate, stearate, palmitate) and acetone

机译：高压相平衡测量系统涉及的热力学模型二氧化碳,乙酯(油酸、硬脂酸、棕榈酸酯)和丙酮

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The aim of this work was to study the phase behavior of systems involving carbon dioxide (CO2), fatty acid ethyl esters (ethyl oleate, ethyl stearate and ethyl palmitate) and acetone at high pressures. The phase behavior involving these components is an important step regarding the design and optimization of industrial processes based on supercritical conditions, such as biodiesel production and fatty esters fractionation involving supercritical and/or pressurized solvents. In addition, supercritical CO2 can offer an interesting alternative for glycerol separation in water-free biodiesel purification processes. The binary systems investigated in this work were CO2 + ethyl oleate, and CO2 + ethyl stearate and these were compared with the CO2 + ethyl palmitate system. The ternary CO2 + ethyl palmitate + acetone was also investigated at two different ethyl palmitate to acetone molar ratios of (1:1) and (1:3). The static synthetic method using a variable-volume view cell was employed to obtain the experimental data in the temperature range of 303.15-353.15K. Vapor-liquid (VL), liquid-liquid (LL) and vapor-liquid-liquid (VLL) phase transitions were observed in these systems. In the binary systems, the solubility increased with the presence of unsaturation and decreased with the number of carbon atoms in the fatty ester chain. Addition of acetone as well as ethanol eliminated the liquid-liquid immiscibility and reduced the pressure transitions, therefore increasing the solubility of the ester in supercritical CO2. The experimental data sets for the binary and ternary systems were successfully modeled using the Peng-Robinson equation of state with the classical van der Waals quadratic mixing rule (PR-vdW2) and Wong-Sandler (PR-WS) mixing rule. Both models showed good performance in the phase equilibrium correlations and in predictions for the binary and ternary systems. (C) 2014 Published by Elsevier B.V. on behalf of The Institution of Chemical Engineers.
机译：这项工作的目的是研究阶段系统包括二氧化碳的行为(二氧化碳),脂肪酸乙酯(油酸乙酯,硬脂酸和棕榈酸乙基)乙酯和丙酮在高压力。有关这些组件是一个重要的步骤工业的设计和优化过程基于超临界条件,等作为生物柴油生产和脂肪酸酯涉及超临界和/或分离加压溶剂。二氧化碳可以提供一个有趣的选择无水的生物柴油中甘油分离净化过程。研究这项工作是CO2 +乙油酸,CO2 +硬脂酸乙酯和这些与二氧化碳相比+棕榈酸乙基系统。三元CO2 +棕榈酸乙酯+丙酮还研究了在两种不同的乙棕榈酸酯(1:1)和丙酮的摩尔比率(1:3)。变量视图单元格来获得实验数据的温度范围303.15 - -353.15 k。(我)和vapor-liquid-liquid (VLL)阶段被观察到在这些系统的转换。双星系统,溶解度增加不饱和现象的存在和减少脂肪酸酯的碳原子的数量链。消除了液-液不混合性减少了压力转换,因此增加酯的溶解度超临界二氧化碳。二元和三元系统是成功的使用Peng-Robinson状态方程建模与经典的范德瓦耳斯二次混合规则(PR-vdW2)和Wong-Sandler (PR-WS)混合规则。相平衡关联和预测二元和三元系统。爱思唯尔出版的帐面价值的代表化学工程师学会。

著录项

相似文献

  • 外文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号